Travel Calculator

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v1.7.5.5:
1. Fix the synchronization bugs between percent related dialog and main calculator window. Now the percents modified could be properly persisted.
2. Fix some traslation typos in percent dialog.
v1.7.5.4:
1. Add an expense tracking feature. To enable it, open general settings dialog and set total rows to 2. Click on the check box and you'll have number tracking feature. May the TRACKING FORCE be with you.
2. Fix display bugs on devices with android version 7.0 and up.